package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.google.j2objc.annotations.AutoreleasePool;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/*
 * 菜品管理业务
 * */
@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /*
     * 新增菜品和对应的口味
     * */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //1.向菜品表插入1条数据
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(dishId);
            }
            //2.向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }


    /*
     * 菜品分页查询
     * */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //1.开始分页查询--PageHelper
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        //2.调用Mapper执行分页查询-pageHelper固定的返回值Page<实体>---VO实体类用于展示页面数据
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        //3.获取pageSize里面的两个参数:total,records
        return new PageResult(page.getTotal(), page.getResult());
    }


    /*
     * 批量删除菜品
     * */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //1.判断当前菜品是否能够删除--是否存在起售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品处于起售中，不允许删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //2.判断当前菜品是否能够删除--是否被套餐关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && !setmealIds.isEmpty()) {
            //当前菜品被套餐关联，不允许删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //3.可以删除，删除菜品数据
        /*
        for (Long id : ids) {
            dishMapper.deleteById(id);
            //4.删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }
        */

        //优化：根据菜品ID集合批量删除菜品数据
        dishMapper.deleteByIds(ids);

        //根据菜品ID删除集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }


    /*
     * 根据id查询菜品和对应的口味
     * */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //1.根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //2.根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //3.将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }


    //根据id修改菜品的基本信息和口味信息
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(dishDTO.getId());
            }
            //2.向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }


    /*
     * 菜品起售、停售
     * */
    @Override
    public void startOrStop(Long id, Integer status) {
        //1.构造一个dish对象用来保存修改的结果
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();

        //2.调用mapper修改菜品的起售停售
        dishMapper.update(dish);

        //3.如果是停售操作，还需要将包含当前菜品的套餐也停售
        if (status == StatusConstant.DISABLE) {
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);//根据菜品id查询套餐id并放入集合中
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && !setmealIds.isEmpty()) {
                for (Long setmealId : dishIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();

                    //4.调用mapper修改套餐
                    setmealMapper.update(setmeal);
                }
            }
        }
    }


    /*
    * 根据分类id查询菜品
    * */
    @Override
    public ArrayList<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /*
    * 查询起售中的菜品和口味
    * */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        //根据分类id查询菜品
        ArrayList<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();
        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }
}
